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Note 19 - Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
19.
Quarterly Financial Data (Unaudited)
 
2018:
  
First Quarter
    
Second Quarter
    
Third Quarter
    
Fourth Quarter
  
Operating revenues
   $
425,708
     $
449,758
     $
460,227
     $
469,222
  
Operating income
(1)
    
14,854
      
20,018
      
22,892
      
21,142
  
Net income
(1) (2)
    
1,159
      
615
      
16,129
      
6,996
  
Basic earnings per share
    
0.18
      
0.04
      
0.33
      
0.14
  
Diluted earnings per share
    
0.18
      
0.04
      
0.33
      
0.14
  
 
2017:
  
First Quarter
    
Second Quarter
    
Third Quarter
    
Fourth Quarter
  
Operating revenues
   $
363,676
     $
370,350
     $
390,126
     $
431,233
  
Operating income
    
1,928
      
2,689
      
11,534
      
12,457
  
Net income (loss)
(3)
    
(4,432
 )    
(8,452
 )    
(675
 )    
9,499
  
Basic earnings (loss) per share
    
(0.69
 )    
(1.32
 )    
(0.11
 )    
1.49
  
Diluted earnings (loss) per share
    
(0.69
 )    
(1.32
 )    
(0.11
 )    
1.49
  
 
(
1
)
Fourth quarter
2018
results include an impairment charge of
$10.7
million related to assets of business held for sale.
 
(
2
)
Fourth quarter
2018
results include an impairment charge of
$1.8
million related to equity method investments.
 
(
3
)
Fourth quarter
2017
results include the impact of the Tax Cuts and Job Act.